The Claude 3 Sonnet LLM gives this, which runs fine (I tested) on Windoze and the Go playground:
https://go.dev/play/p/YjNQ5Ru_eLq On Saturday, March 22, 2025 at 10:12:19 AM UTC Kanak Bhatia wrote: > Hey everyone, > > I’m trying to learn how to build a raw UDP socket in Go (on Windows) using > golang.org/x/sys/windows. My goal is to send and receive raw UDP packets. > > *What I’m trying to do:* > > 1. *Create a raw socket:* > > socket, err := windows.Socket(windows.AF_INET, windows.SOCK_RAW, > windows.IPPROTO_IP) if err != nil { fmt.Printf("Error creating socket: > %v\n", err) return } defer windows.Closesocket(socket) > > *2. Send a UDP message:* > func sendUDPPacket(socket windows.Handle, srcPort, destPort int, targetIP > string, data string) error { > payload := []byte(data) > packet := createUDPHeader(srcPort, destPort, payload) > > // Define the target address (IP + Port) > addr := windows.SockaddrInet4{Port: destPort} > copy(addr.Addr[:], []byte{127, 0, 0, 1}) // Sending to localhost > > // Send the packet > return windows.Sendto(socket, packet, 0, &addr) > } > > *3. Receive a UDP message:* > func receiveUDPPacket(socket windows.Handle) { > buffer := make([]byte, 1024) > > for { > // Receive data from the socket > n, from, err := windows.Recvfrom(socket, buffer, 0) > if err != nil { > fmt.Println("Error receiving data:", err) > break > } > > // Extract the header (8 bytes) and payload > fmt.Printf("📩 Received raw packet (%d bytes): %x\n", n, buffer[:n]) > fmt.Printf("👉 Payload: %s\n", buffer[8:n]) > fmt.Printf("👉 From: %+v\n", from) > } > } > ------------------------------ > > *The problem:* > > Sending works perfectly, but receiving fails immediately with this error: > go run main.go 8000 8001 > 🚀 Type your message (type 'exit' to quit): > 💬 Enter message: Error receiving data: An invalid argument was supplied. > hello > ✅ Message sent! > 💬 Enter message: hello 2 > ✅ Message sent! > > > *I’m stuck and would love some help:* > > I’m still learning how raw sockets and protocols actually work. > > -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. To view this discussion visit https://groups.google.com/d/msgid/golang-nuts/9432717f-55b9-4ac6-b7ac-4e1e359d39cen%40googlegroups.com.
